Cornell University

Information Technology RIGHTS and RESPONSIBILITIES

Reporting incidents to other sites


  1. Identifying the source
  2. Who can you report the problem to once the source has been identified?
  3. Preparing the complaint or report

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Identifying the source
The return address on an e-mail message may not be the real source of the e-mail. It's possible that a third party is trying to enlist your unknowing help in mail bombing the supposed sender. The third party first sends you and thousands of other people an annoying message that appears to come from the intended victim, then just sits back and waits for the victim to receive the angry responses. E-mail can be forged, and detecting a forgery can be difficult.

Finding header information
The "envelope" contains important header information. Most e-mail applications hide headers (known as SMTP or trace headers) that help identify the source of the message, but they can be displayed by issuing the appropriate commands. With Eudora, open the message and click on "blah blah blah" (upper left corner of window). For other e-mail applications, see the CIT HelpDesk's page on How to obtain header info from various e-mail clients. News reader applications usually have an option to display header information (e.g., Newswatcher has a "show details" option).

Deciphering headers
Deciphering the headers is not easy, even for experts. Here is a typical e-mail header. Not all headers contain the same information, so you may need to check with your local computer support staff for additional help. The bolded parts are the most useful to examine.

  1. Return-Path: dork@geeks.com
  2. Received: from server1.geeks.com (SERVER1.GEEKS.COM [111.222.333.444]) by postoffice2.mail.cornell.edu (8.7.5/8.7.3) with ESMTP id JAA28319 for ; Fri, 19 Jul 1996 09:50:30 -0400 (EDT)
  3. Received: (from daemon@localhost) by server1.geeks.com (8.7.5/8.7.3) id JAA01199; Fri, 19 Jul 1996 09:50:29 -0400 (EDT)
  4. Received: from [111.222.333.999] ([111.222.333.999]) by server1.geeks.com (8.7.5/8.7.3) with SMTP id JAA01159 for ; Fri, 19 Jul 1996 09:50:24 -0400 (EDT)
  5. X-Sender: dork@server1.geeks.com
  6. Message-Id:
  7. Mime-Version: 1.0
  8. Content-Type: text/plain; charset="us-ascii"
  9. Date: Fri, 19 Jul 1996 09:50:11 -0400
  10. To: my-netid@cornell.edu
  11. From: dork@geeks.com
  12. Subject: chain mail - pass this on for luck

To identify the sender, look at lines 1, 4, 5, and 11 in the example above. If they exist, they should contain similar information about the e-mail address of the sender. If the information is very different, then it's a possible forgery. The most reliable field to use to identify the actual sender is in line 5 (X-Sender).

To identify the client computer used to initiate the e-mail, look at line 4 in the header above. It was sent from a computer with the IP address of 111.222.333.999. In some cases, this can be traced to a specific location or person.

To identify the server used to receive and deliver the e-mail, look at line 4. In this example, the server that received the e-mail and later delivered it to postoffice2.mail.cornell.edu is shown as server1.geeks.com. If you want to complain, use the domain name from line 4 (geeks.com in this example) and follow the instructions below.

In some cases, the message may be sent via an anonymous re-mailer. Mail from a re-mailer is usually identified as such and will often contain a disclaimer about the contents. Sometimes the message will identify an address to complain to. However, these sites rarely take any action and will never disclose the true identity of the sender without a court order. Often they do not know the identity of the sender.

Who can you report the problem to once the source has been identified?

Preparing the complaint or report


This page is developed and maintained by the Office of Information Technologies. Please write to us with your feedback.

E-mail: it-policies@cornell.edu

Last updated 1999 March 15